Just checked mine and no cracks whatsoever. Mine is a bit different than yours though. There is no hole in my crossmember where your cracks are crossing through. I wonder if this was a weak area and they made a change later in the era.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K